CN112770348A - Wireless mobile communication method and device - Google Patents

Wireless mobile communication method and device Download PDF

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CN112770348A
CN112770348A CN202011514660.3A CN202011514660A CN112770348A CN 112770348 A CN112770348 A CN 112770348A CN 202011514660 A CN202011514660 A CN 202011514660A CN 112770348 A CN112770348 A CN 112770348A
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node
candidate
parent node
dis
dis message
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朱兰
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Spreadtrum Semiconductor Chengdu Co Ltd
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Spreadtrum Semiconductor Chengdu Co Ltd
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Priority to PCT/CN2021/134549 priority patent/WO2022127588A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

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Abstract

The application discloses a wireless mobile communication method and a device, wherein the method comprises the following steps: within a time period indicated by an information request DIS message timer of a mobile node, transmitting a DIS message to at least one neighbor node; if receiving the information object DIO message, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list; after the time period is started from the timing OF the DIS message timer, whether a condition for reestablishing the communication connection is met or not is detected, if yes, a target father node is determined in at least one candidate father node contained in the candidate father node list according to the target function OF value corresponding to each candidate father node in the candidate father node list; and establishing a communication connection with the target parent node. By the method, the efficiency and the stability of the wireless mobile communication can be improved.

Description

Wireless mobile communication method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a wireless mobile communication method and apparatus.
Background
An Internet Protocol Version 6 (IPv 6) wireless sensor network has been widely used in life scenes such as medical care, industrial monitoring, smart home, and the like, which benefits from the characteristics of low bandwidth, small range, small memory amount, low cost, and the like of the IPv6 wireless sensor node. For example, the IPv6 wireless sensor network is preferably applied to sensor devices worn on patients in healthcare, robots in the industrial field, and the like.
The current IPv6 wireless sensor network is designed for a static network, namely, the information interaction can be better carried out only with nodes in a static state. When a mobile node exists in the network, the mobile node is likely to leave the communication range of the currently connected routing node, so that the phenomena of packet loss, instability and the like of the whole IPv6 wireless sensor network are caused.
Disclosure of Invention
The application discloses a wireless mobile communication method and a wireless mobile communication device, which can improve the efficiency and stability of wireless mobile communication.
In a first aspect, an embodiment of the present application provides a wireless mobile communication method and apparatus, which are applied to a mobile node, and the method includes:
within a time period indicated by an information request DIS message timer of a mobile node, transmitting a DIS message to at least one neighbor node;
if receiving the information object DIO message, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list;
after the time period is started from the timing OF the DIS message timer, whether a condition for reestablishing the communication connection is met or not is detected, if yes, a target father node is determined in at least one candidate father node contained in the candidate father node list according to the target function OF value corresponding to each candidate father node in the candidate father node list;
and establishing a communication connection with the target parent node.
In one embodiment, the target function OF value OF the candidate parent node is determined according to the DIO message sent by the candidate parent node; the candidate parent node and the OF values OF the candidate parent node are added to the list OF candidate parent nodes.
In an embodiment, after the time period elapses from the beginning OF the timing OF the DIS message timer, if it is detected that the mobile node is currently connected to the first parent node, the OF value OF the first parent node is obtained; and detecting whether the OF value OF the first father node is lower than a preset OF value threshold, and if so, determining that the condition OF communication connection reestablishment is met.
In one embodiment, the mobile node establishes a communication connection with the second parent node within a time period indicated by the information object DIS message timer of the mobile node.
In one embodiment, after the period of time has elapsed since the DIS message timer was started, it is detected whether the candidate parent node list includes the second parent node, and if not, it is determined that the condition for reestablishing the communication connection is satisfied.
In one embodiment, the mobile node establishes a communication connection with the second parent node within a time period indicated by the information object DIS message timer of the mobile node.
In one embodiment, if it is detected that the average signal quality ARSSI value of the second parent node transmission signal received by the mobile node is lower than the preset ARSSI value threshold value within the time period indicated by the information request DIS message timer of the mobile node, it is determined that the condition for reestablishing the communication connection is satisfied.
In one embodiment, if it is detected that the mobile node is not connected to any parent node within a time period indicated by the DIS message timer of the mobile node, updating the running duration of the DIS message timer to an initial running duration to obtain an updated DIS message timer; within the time period indicated by the updated DIS message timer, transmitting a DIS message to at least one neighbor node; if receiving the information object DIO message, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list; after the time period elapses from the timing OF the updated DIS message timer, determining a target parent node in at least one candidate parent node included in the candidate parent node list according to the target function OF value corresponding to each candidate parent node in the candidate parent node list; and establishing a communication connection with the target parent node.
In an embodiment, according to the OF values corresponding to the candidate parent nodes in the candidate parent node list, the candidate parent node with the largest OF value is determined as the target parent node from at least one candidate parent node included in the candidate parent node list.
In one embodiment, according to an objective function OF value corresponding to each candidate parent node in a candidate parent node list, after a target parent node is determined in at least one candidate parent node included in the candidate parent node list, a first operation duration is determined according to a DIO message sent by the target parent node; updating the running time length of the DIS message timer to a first running time length to obtain an updated DIS message timer; and in a time period indicated by the updated DIS message timer, transmitting a DIS message to at least one neighbor node, triggering and executing if receiving an information object DIO message, taking the neighbor node transmitting the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list.
In one embodiment, after a DIS message is sent to at least one neighbor node within a time period indicated by a DIS message timer requested by information of a mobile node, if a DIO message sent by any neighbor node in the at least one neighbor node is not received, updating the running duration of the DIS message timer to an initial running duration to obtain an updated DIS message timer; and transmitting a DIS message to at least one father node in a time period indicated by the updated DIS message timer, triggering execution, if receiving an advertisement DIO message, taking the father node transmitting the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list.
In an embodiment, the DIS message includes an identity MS indicating that the mobile node is in a moving state, and the DIO message includes an identity MF indicating that the mobile node is in a moving state.
In a second aspect, an embodiment of the present application provides a wireless mobile communication apparatus, including:
a communication unit, configured to send a DIS message to at least one neighboring node within a time period indicated by a DIS message timer requested by an information request of a mobile node;
the processing unit is used for taking a neighbor node which sends the DIO message as a candidate father node and adding the candidate father node into a candidate father node list if the DIO message of the information object is received;
the processing unit is further configured to detect whether a condition for reestablishing a communication connection is satisfied after the period OF time elapses from the time when the DIS message timer is started, and if the condition is satisfied, determine a target parent node among at least one candidate parent node included in the candidate parent node list according to an objective function OF value corresponding to each candidate parent node in the candidate parent node list;
and the connection unit is used for establishing communication connection with the target father node.
In a third aspect, an embodiment of the present application provides a wireless mobile communication device, including a processor, a memory, and a communication interface, where the processor, the memory, and the communication interface are connected to each other, where the memory is used to store a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to perform the wireless mobile communication method as described in the first aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing one or more instructions adapted to be loaded by a processor and execute the wireless mobile communication method as described in the first aspect.
In the embodiment of the application, the mobile node sends DIS information to at least one neighbor node in a time period indicated by an information request DIS information timer of the mobile node; if receiving the information object DIO message, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list; after the time period is started from the timing OF the DIS message timer, whether a condition for reestablishing the communication connection is met or not is detected, if yes, a target father node is determined in at least one candidate father node contained in the candidate father node list according to the target function OF value corresponding to each candidate father node in the candidate father node list; and establishing a communication connection with the target parent node. By the method, the efficiency and the stability of the wireless mobile communication can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a diagram of a wireless communication network architecture according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a wireless mobile communication method according to an embodiment of the present application;
fig. 3 is a schematic diagram of a frame format of a DIS message according to an embodiment of the present application;
fig. 4 is a schematic diagram of a frame format of a DIO message according to an embodiment of the present application;
fig. 5 is a schematic diagram of a mobile node not leaving a current parent node according to an embodiment of the present application;
fig. 6 is a schematic diagram illustrating a mobile node leaving a communication range of a last parent node according to an embodiment of the present application;
fig. 7 is a schematic diagram of a location relationship between a mobile node and a parent node according to an embodiment of the present application;
fig. 8 is a schematic diagram illustrating a mobile node leaving a current network according to an embodiment of the present application;
fig. 9 is a schematic diagram illustrating a first network access of a mobile node according to an embodiment of the present application;
fig. 10 is a schematic flowchart of triggering mobility detection according to an embodiment of the present application;
fig. 11 is a schematic flowchart of a method for updating a running duration by a DIS message timer according to an embodiment of the present application;
fig. 12 is a schematic flowchart of determining a target parent node according to an embodiment of the present disclosure;
fig. 13 is a schematic diagram of elements of a wireless mobile communication device according to an embodiment of the present application;
fig. 14 is a simplified block diagram of a wireless mobile communication device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In order to better understand the embodiments of the present application, the following terms refer to the embodiments of the present application:
internet Protocol Version 6 (Internet Protocol Version 6, IPv 6): is the next generation IP protocol designed by the Internet Engineering Task Force (IETF) to replace IPv4, and the number of addresses can be named as one address for each sand worldwide. The biggest problem of the IPv4 is that the network address resource is insufficient, and the application and the development of the Internet are severely restricted. The use of the IPv6 not only solves the problem of the number of network address resources, but also solves the obstacle of connecting various access devices to the Internet.
Low-Power wireless local area network (IPv6 Routing Protocol for Low-Power and Lossy Networks, RPL) based on IP technology: a low power consumption wireless local area network combines IEEE802.15.4 and IPv6 protocols. RPL is a distance vector routing protocol that can construct object-oriented directed acyclic graph DODAG, or just) control traffic except for a set of characteristic constraints, support local repair, etc., and provides a flexible approach where each node performs DODAG discovery, construction, and maintenance.
Directed Acyclic Graph (DODAG) Oriented with Destination node: is a tree-shaped routing structure.
DODAG Information Solicitation (DIS): the Information Object (DIO) message used to request a DODAG Information Object from an RPL node can also be used to explore neighbor nodes in an adjacent DODAG.
DODAG Information Object (DIO): the node self information such as RANK, MAC address and the like is contained, and the neighbor node determines whether to select the neighbor node as a parent node or not only after receiving DIO.
Objective Function (OF): OF defines the route metric criteria, target path optimization, and the way in which the Rank value is calculated. At the same time, OF also specifies how to determine the parent node in the DODAG, i.e. how to construct the DODAG. The objective function computes an optimal path using a set of metrics and constraints.
Destination Advertisement (DAO): this packet is for data download, and the child node reports its distance, etc., to the parent node.
Received Signal Strength Indication (RSSI): is a theoretical term for radio frequency signals and is mainly applied to distance measurement between a transmitter and a receiver. The method determines the distance according to the energy intensity of the received signal, and has higher requirements on communication channel parameters. The distance measurement theory is as follows: in terms of the transmission of radio or acoustic waves in a medium, the signal power is a principle of attenuation with propagation distance. The distance between the nodes can be calculated through an attenuation model between the signals and the distance according to the transmitting power of the known signals of the beacon nodes and the power of the signals received by the nodes.
Expected Transmission Count (ETX): successful transmission of each data packet, the expected average number of transmissions.
In order to better understand the embodiments of the present application, a network architecture to which the embodiments of the present application are applicable is described below.
Fig. 1 is a diagram illustrating a wireless communication network architecture according to an embodiment of the present application. The wireless communication network architecture diagram includes nodes 1-9, a mobile node, and an IPv6 network. Nodes 1-9 may be routing nodes, typically fixed nodes. Here, since node 1 is network-connected to IPv6, node 1 may also be referred to as a border node. The routing node may send a wireless signal to establish a connection with the mobile node. The mobile node may be a device with sensors, such as a sensor device worn on a patient in healthcare, a robot in the industrial field, and the like. In the nodes 1 to 9, each node may be respectively distributed with its own communication range, and the size of the communication range of each node may be the same or different, depending on the signal transmission power of each node. In fig. 1, node 9 points to node 6, node 6 points to node 3, node 3 points to node 5, node 5 points to node 4, and finally node 4 points to node 1. This indicates that node 6 is a parent node of node 9 and node 3 is a parent node of node 6. In the embodiment of the application, a concept of a parent node exists between the routing nodes, and when a mobile node establishes a connection with a certain routing node, the routing node can be the parent node of the mobile node. And the mobile node may be located within the communication range of a plurality of routing nodes, these nodes may become the neighbor nodes of the mobile node.
It should be noted that, for convenience of description, the network architecture shown in fig. 1 is a communication range circle drawn by taking a mobile node as a center, which is an ideal state, that is, dimensions such as signal transmission power, coverage area, signal attenuation degree and the like of each of the nodes 1 to 9 are all the same. Therefore, the communication range can be drawn by taking the mobile node as the center of a circle. In practical application, the communication range should be drawn with each routing node as a center, and the communication range is not uniform in consideration of a complex environment in an actual situation, so that the embodiment of the present application is described in a simplified form without departing from a practical application scenario. The mobile node has a moving track in a network formed by the nodes 1 to 9, and the mobile node enters the network from the leftmost side and exits the network from the rightmost side as shown by a dotted arrow in the figure.
In order to improve the efficiency of wireless mobile communication, embodiments of the present application provide a wireless mobile communication method and apparatus, and the following further describes the wireless mobile communication method and apparatus provided by embodiments of the present application in detail.
Referring to fig. 2, fig. 2 is a flowchart illustrating a wireless mobile communication method according to an embodiment of the present application. The mobile node may be a terminal device comprising a sensor. When the mobile node performs the procedure shown in fig. 2, the following steps may be included:
210. and transmitting the DIS message to at least one parent node in a time period indicated by the DIS message timer requested by the information of the mobile node.
Wherein the information requests DIS message timer (running duration I)m) Is always on after the slave terminal equipment is startedAnd (5) starting to operate. The operation duration of the DIS message timer may be an initial operation duration (I) when the mobile node is startedmin) May be a fixed value that may be determined according to the associated protocol and is not limited herein. During the operation of the DIS message timer, i.e., the time period indicated by the DIS message timer, the mobile node may continuously broadcast at least one DIS message to request the DIO message sent by the neighbor node, which is equivalent to detecting the surrounding neighbor nodes. In the embodiment of the application, the routing node, the neighbor node and the father node can be the same concept, and the routing node can be used as a node for communication connection; when the communication range of the routing node is provided with the mobile node, the routing node is the neighbor node of the mobile node; and the parent node is the routing node to which the mobile node is connected.
The frame structure of the DIS message may be seen in fig. 3, among others. The DIS message may include a Flag bit (Flag), a Reversed bit, a Mobile State (MS) bit, and an option (option) bit. The MS may be configured to indicate whether the mobile node is currently in a moving state, for example, when the MS is 1, it indicates that the mobile node is in the moving state, and certainly, when the MS is 0, it may indicate that the mobile node is in the moving state, which is not limited.
For a routing node, if a DIS message sent by the mobile node can be received, indicating that the mobile node is within communication range of the routing node, the routing node may then send an information object DIO message to the mobile node. Thus, if there are multiple neighboring nodes around the mobile node, multiple DIO messages can be received.
220. And if the information object DIO message is received, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list.
Specifically, the mobile node may determine the objective function OF value OF a neighboring node (candidate parent node) according to a DIO message sent by the candidate parent node. And adds both the candidate parent node and the OF value for the candidate parent node to the list OF candidate parent nodes. The OF value is an important indicator that is subsequently used to determine the target parent node. In addition, the frame structure of the DIO message can be seen in fig. 4. The DIO message structure may include an RPL Instance identification (Instance ID), which may indicate to which RPL Instance the DODAG belongs; the method comprises Version Number (Version Number), random Number (Rank), Grounded (G), Operation Mode (Mode of Operation, MOP), DODAG priority (DODAG Preference), Destination Advertisement initiation Sequence Number (DTSN), Flags (Flags), Mobile Flag (MF), Reversed bit, DODAG identification (128-bit IPv6 address, set by the DODAG root, and uniquely identifying a DODAG. Where MF is an indication flag for indicating that the mobile node is in a moving state.
It should be noted that, in order to ensure robustness (Robust) of the network system, the number of DIO messages sent by each neighboring node may be one or more, and the embodiment of the present application is not limited. In addition, the OF value OF each candidate parent node may be determined by:
according to the embodiment OF the application, calculation can be performed through three routing metrics, wherein the three routing metrics are respectively expected transmission times (ETX), RSSI and Residual Energy (RE), and OF values can be obtained. The calculation formula is as follows:
Figure BDA0002846133990000081
wherein α, β, γ are weighted values, and α + β + γ is 1. Each weight value may be adjusted according to priority. ETX represents the expected number of transmissions required for the current neighbor node to successfully transmit a data packet, and the calculation formula is as follows. And ETXmaxIs the ETX value corresponding to the node with the maximum ETX value in the neighbor nodes passed by the mobile node. Similarly, RSSImaxAnd the RSSI value corresponding to the node with the maximum RSSI value among the neighbor nodes passed by the mobile node. REtotalIt is the sum of the energy remaining in the various neighboring nodes traversed by the mobile node. The neighbor node passed by the mobile node means that the mobile node enters the communication range of the neighbor nodeAnd (4) the following steps.
ETX(N)＝ETXold*β+ETXnew*(1-β)
Figure BDA0002846133990000091
Wherein, N represents the number of the neighbor node, as shown in fig. 1, N of node 1 is 1, N of node 2 is 2, and so on. ETXoldIs the old ETX value of the node, the default value of beta is 0.9, Ps→dRefers to the probability, P, that a data packet successfully reaches the recipientd→sRefers to the probability of the sending node successfully receiving the ACK. The RSSI value is a metric for measuring the signal power of the radio frequency transceiver, which reflects the signal strength of the link between the node and the neighboring node. The RSSI is calculated as follows:
RSSI＝RSSI_VALUE+RSSI_OFFSET
the residual energy can avoid selecting a node with too low energy as an optimal parent node in the process of selecting the parent node, and the calculation formula is as follows:
Ec＝V×(TapIap+TlpIlp+TtxItx+TrxIrx+ΣTniIni)
wherein, TapIapIs the time and current consumed by the node during the active phase, TlpIlpIs the time and current consumed by the low power stage, TtxItxIs the time and current consumed by the transmission phase, TrxIrxIs the time and current consumed by the receiving node, TniIniIs the time and current consumed by the sensing phase and V is the voltage.
230. After the time period is started from the timing OF the DIS message timer, whether the condition OF communication connection reestablishment is met or not is detected, and if the condition is met, a target father node is determined in at least one candidate father node contained in the candidate father node list according to the target function OF value corresponding to each candidate father node in the candidate father node list.
In a possible implementation manner, after the period OF time indicated by the DIS message timer elapses from the beginning OF the timing OF the DIS message timer, that is, after the timing OF the DIS message timer is ended, if it is detected that the current mobile node is connected to the first parent node, the OF value OF the first parent node may be obtained. As shown in fig. 5, the first parent node may be node 2, with "M" being the mobile node. At the end of the DIS timer run, the mobile node is currently connected to the first parent node and is currently within communication range of the first parent node. That means that the first father node is a target father node determined after the last operation of the DIS message timer, and since the mobile node is displaced during the operation of the DIS message timer, the candidate father node list is updated after the operation of the DIS message timer is finished. The mobile node may detect whether the OF value OF the first parent node is lower than a preset OF value threshold, and if so, it indicates that the first parent node cannot normally communicate with the mobile node, and it is determined that the condition for reestablishing the communication connection is satisfied. And if the OF value OF the first parent node is not lower than the preset OF value threshold, indicating that the mobile node can still perform normal communication with the first parent node, determining that the condition for reestablishing the communication connection is not met. Wherein, if the mobile node determines that the condition for reestablishing the communication connection is satisfied, a new parent node is determined again to be connected. And if the OF value OF the first parent node is not lower than the preset OF value threshold, the mobile node will not switch the parent node even if the mobile node detects a neighbor node with a higher OF value. This can reduce unnecessary handover and save network resources.
In one possible implementation, the mobile node establishes a communication connection with the second parent node during a time period indicated by the DIS message timer. Specifically, the mobile node connects to the second node during the operation of the DIS message timer and disconnects from the second parent node before the operation of the DIS message timer is completed. As shown in fig. 6, the second parent node may be node 2. If the mobile node detects that the indicated time period is elapsed after the DIS message timer starts to run, whether the candidate parent node list generated after the DIS message timer runs is judged to include the second parent node. If not, determining that the condition of communication connection reestablishment is met.
Optionally, for the situation shown in fig. 6, if it is detected that the Average signal quality (Average RSSI, ARSSI) of the received signal sent by the second parent node is lower than the preset ARSSI value threshold in the time period indicated by the DIS message timer requested by the information of the mobile node, it may be determined that the communication connection between the mobile node and the second parent node is disconnected, and the condition for reestablishing the communication connection is satisfied. The ARSSI of the second parent node transmission signal received by the mobile node is lower than a preset ARSSI value threshold, and this condition is called to trigger "mobility detection". It should be noted that the mobile node triggering the mobility detection may determine that the condition for the communication connection re-establishment is satisfied. According to the embodiment of the application, the mobility detection is carried out by adopting the weighted average RSSI value, information interaction is carried out between the mobile node and the father node, and the ARSSI value is periodically calculated through the interaction information. If the ARSSI value exceeds the threshold value, the link is stable, and data can be continuously transmitted between the mobile node and the father node; if the value of the ARSSI is below the threshold, it indicates that the link between the nodes is unstable, and if the data continues to be transmitted at this time, the data packets are lost. In this embodiment of the present application, the period of the ARSSI value may be 5, that is, the ARSSI values of the 5 RSSIs are calculated every 5 RSSIs are received. The ARSSI value threshold range is set to [ -92dBm, -80dBm ], i.e. the threshold can be determined on a case-by-case basis. The calculation formula of the ARSSI value may be:
Figure BDA0002846133990000101
the mobile node can determine that the condition for the communication connection re-establishment is satisfied according to the above 3 cases. The mobile node determines a target parent node from the candidate parent node list to establish a new communication connection after the DIS message timer runs. Specifically, the mobile node determines, according to the OF value corresponding to each candidate parent node in the candidate parent node list, a parent node with the largest OF value as a target parent node from at least one candidate parent node included in the candidate parent node list.
240. And establishing a communication connection with the target parent node.
Specifically, the mobile node may send a connect DAO message to the target parent node and a disconnect DAO message to the previous parent node. If the mobile node has left the communication range of the last parent node, a disconnect DAO message for the last parent node may be sent to the target parent node, which forwards the disconnect DAO message to the last parent node.
In one possible implementation, the establishment of a communication connection between the mobile node and the target parent node is actually a link handover procedure. Generally, the link handover may use a soft handover method. Soft handoff will use two DAO messages for link handoff, a connect DAO message and a disconnect DAO message. The connection DAO message is used to connect a new optimal parent node, i.e., a target parent node; the disconnected DAO message is used to delete the path between the last parent node, disconnecting the previous link. When the mobile node selects its optimal parent node, it will send two timely DAO messages to the old parent node (the previous parent node) and the new parent node (the target parent node). Disconnecting the DAO message then deletes the old downward path before, and connecting the DAO message creates a new link.
In one possible implementation, soft handoff is the default mode, and the mobile node may also perform link handoff by way of hard handoff. Hard handoffs are only used under certain conditions, such as a period of time (e.g., 150 milliseconds) when the mobile node does not receive any information from the parent node; or before the link before disconnection, no information of surrounding neighbor nodes is received within a period of time; or when the network is busy.
After the mobile node establishes the communication connection with the target parent node, the first operation duration may be determined according to DIO information sent by the target parent node. The DIS message timer restarts timing after each operation is completed, and the length of each timing needs to be calculated. The first operation time period is a time period for the next operation of the DIS message timer. And after determining the first running time length, the mobile node updates the running time length of the DIS message timer to the first running time length to obtain an updated DIS message timer. The mobile node may send a DIS message to at least one neighbor node within a time period indicated by the updated DIS message timer, trigger execution, if a DIO message is received, take the neighbor node that sent the DIO message as a candidate parent node, and add the candidate parent node to a candidate parent node list. Therefore, the neighbor nodes can be circularly detected, and the candidate father node list can be circularly updated.
In a possible implementation manner, the method for determining the next operation duration of the DIS message timer, i.e. the first operation duration, may be implemented by the following steps:
according to research, when a mobile node moves from one position to another position, due to the Doppler frequency, a Doppler frequency difference exists in the received signals, and the Doppler frequency difference is the Doppler frequency. From the doppler frequency, the direction and speed of movement of the mobile node can be found. Let the moving speed of the mobile node be VmIf the angle between the mobile node and the father node is theta, the electromagnetic wave velocity is c, and the Doppler frequency is fdReception frequency of frThen the doppler frequency can be obtained by the following equation:
Figure BDA0002846133990000121
so that the moving speed V of the mobile nodenCan be obtained from the above formula:
Figure BDA0002846133990000122
when the mobile node approaches or exits the parent node, the mobile node must travel a distance, which is the time required for the mobile node to leave the current parent node transmission range, and then define the time required to leave the parent node transmission range as the time of the DIS message timer. Fig. 7 is a schematic diagram illustrating the mobile node leaving the communication range of the current parent node (node 5). Wherein FIG. 7 is a view showing node 5 asThe communication range of the node 5 is drawn by the circle center; theta is the angle between the mobile node and its current parent node, dfIs the distance between the mobile node and its current parent node. The direction of movement of the mobile node may be measured by sideband filtering, offset carrier demodulation, co/quadrature demodulation, etc., depending on the doppler frequency transmitted by the router node.
The distance is then estimated by using the variation of the RSSI value with the variation of the distance. Since the router node transmits a signal of fixed strength, the distance can be estimated from the strength of the attenuated signal received by the mobile node. The transmission Loss (Loss, L) in the transmitted signal (in dBm) is calculated as the difference between the two signals (which can be determined from the DIO message sent by the parent node), and is obtained from the fries free space propagation model:
Figure BDA0002846133990000123
wherein λ is the wavelength of the electromagnetic wave, and d can be calculated according to the above formulafThen d can be calculated according to the second law of the cosine laweThe calculation formula is as follows:
Figure BDA0002846133990000124
setting DIS message timer time takes into account randomness of speed and direction of the mobile node during movement, and for more accurate setting of the timer time, the time interval is set to be [ t/2, t [ ]]And (4) internal selection. Timer setting time ImThe calculation formula is as follows:
Figure BDA0002846133990000125
Im＝x,x∈[t/2,t]
by the method, the I of the DIS message timer can be determinedmI.e. the first operating time period.
In a possible implementation manner, after the mobile node sends the DIS message to the at least one neighboring node within the time period indicated by the DIS message timer, if a DIO message sent by any one of the at least one neighboring node is not received, it is determined that the mobile node has left the current network. As shown in fig. 8, the mobile node is considered to have left the network because no neighbor node exists in the current communication range. The mobile node may update the running duration of the DIS message timer to the initial running duration to obtain an updated DIS message timer. The mobile node may send a DIS message to at least one neighbor node within a time period indicated by the updated DIS message timer, trigger execution, if a DIO message is received, take the neighbor node that sent the DIO message as a candidate parent node, and add the candidate parent node to a candidate parent node list. Therefore, the neighbor nodes can be circularly detected, and the candidate father node list can be circularly updated.
In one possible implementation, as shown in fig. 9, the case where the mobile node first accesses the network is shown, for example, the mobile node is started for the first time, or the mobile node enters the current network in a state where no parent node is connected during the last run of the DIS message timer. And if the mobile node detects that the mobile node is not connected with any father node in the time period indicated by the DIS message timer, updating the running time of the DIS message timer to the initial running time to obtain the updated DIS message timer. That is, if the mobile node does not always detect the neighbor node to determine the target parent node, the mobile node maintains the operation duration of the DIS message timer as the initial operation duration. The mobile node may transmit the DIS message to the at least one neighbor node within a time period indicated by the updated DIS message timer. And if the DIO information is received, taking the neighbor node sending the DIO information as a candidate father node, and adding the candidate father node into a candidate father node list. When the updated DIS message timer starts to count and passes the time period indicated by the updated DIS message timer, the mobile node may determine a target parent node among at least one candidate parent node included in the candidate parent node list according to the OF value corresponding to each candidate parent node in the candidate parent node list, and establish a communication connection with the target parent node.
Through the embodiment of the application, the mobile node can send the DIS message to at least one neighbor node within the time period indicated by the DIS message timer, and if the DIO message is received, the neighbor node in the current network can be determined. The mobile node may take the neighbor node that sent the DIO message as a candidate parent node and calculate the OF value OF the candidate parent node, adding both to the candidate parent node list. After the DIS message timer is finished, it may be detected whether a new parent node (target parent node) needs to be selected to establish a connection, and if so, the target parent node may be determined according to the OF values OF the candidate parent nodes in the candidate parent node list, and a communication connection may be established with the target parent node. By the method, the mobile node can continuously search for the neighbor node in the network, and quickly determine the target parent node to establish communication connection under the condition of needing to be switched to a new parent node, so that the efficiency and the stability of wireless mobile communication can be improved.
Referring to fig. 10, fig. 10 is a schematic flowchart illustrating a process of triggering mobility detection according to an embodiment of the present application. When the mobile node performs the flow of fig. 10, the following steps may be included:
1010. and (5) periodically collecting RSSI values to calculate an ARSSI value.
1020. And judging whether the ARSSI value is higher than an ARSSI value threshold value.
1030. If yes, continuing to keep connection with the current father node.
When the ARSSI value is higher than the ARSSI value threshold value, the link is stable, and the mobile node and the father node can continue to transmit data.
1040. If not, triggering mobility detection, and selecting a new father node to establish communication connection.
If the value of the ARSSI is below the threshold, it indicates that the link between the nodes is unstable, and if the data continues to be transmitted at this time, the data packets are lost.
By the method, the mobile node can trigger mobility detection under the condition that the ARSSI value is lower than the ARSSI value threshold value so as to determine a target father node according to the candidate father node list, wherein the target father node is a new father node and is connected with the new father node, and therefore the mobile node can be ensured to be accessed into a network in time.
Referring to fig. 11, fig. 11 is a schematic flowchart of a method for updating a running time duration of a DIS message timer according to an embodiment of the present application. When the mobile node performs the flow of fig. 11, the following steps may be included:
1110. the DIS message is broadcast to request the DIO message during a period indicated by the DIS message timer.
1120. And if the target father node is determined, calculating the moving speed and the moving direction of the mobile node according to the DIO message of the target father node.
1130. The distance of the mobile node from the communication range of the target parent node is calculated.
1140. And calculating the time interval and updating the DIS message timer.
The time interval is the distance d of the mobile node from the communication range of the target parent nodeeMoving speed V with mobile nodemThe ratio of (a) to (b).
1150. Running the updated DIS message timer.
It should be noted that if the mobile node does not determine a new parent node after the time period indicated by the DIS message timer, the running duration of the DIS message timer may be consistent with the running duration of the last running. May be described herein as updating the operation duration of the DIS message timer to the operation duration of the last DIS message timer.
By the method, the DIS message timer can be updated in time, and the mobile node can continuously broadcast the DIS message in the DIS message timer to request the DIO message. Therefore, the candidate father node list can be updated in real time, so that the mobile node can be connected to a new father node in time when needed, and the efficiency and the stability of wireless mobile communication are improved.
Referring to fig. 12, fig. 12 is a schematic flowchart illustrating a process for determining a target parent node according to an embodiment of the present disclosure. When the mobile node performs the flow of fig. 11, the following steps may be included:
1210. the DIS message timer is started.
And if the mobile node is not connected with any parent node in the last DIS message timer running period, determining the DIS message timer to be the initial running time length.
1220. And broadcasting DIS messages and receiving DIO messages.
1230. It is determined whether the DIS message timer expires or whether the mobile node triggers mobility detection.
1240. If the DIS message timer is not expired and the mobile node does not trigger the mobility detection, the mobile node is connected with a father node, and then data transmission continues through the father node.
1250. If DIS message timer expires or mobile node triggers mobility detection, it is determined whether new father node needs to establish communication connection.
1260. And if the communication connection of the new father node needs to be established, determining a target node according to the candidate father node list.
1270. The DIS message timer is updated.
If performed in step 1250, it is not necessary to determine that a new parent node is establishing a communication connection. Here, the DIS message timer is updated, and the operation duration of the DIS message timer is not changed. And if the DIS message timer is expired and the mobile node does not receive any DIO message, determining that the mobile node leaves the network, and updating the running time of the DIS message timer to the initial running time.
If step 1260 is executed, which indicates that the mobile node is connected to the target parent node, the next operation duration of the DIS message timer may be determined according to the DIO message of the target parent node, and the DIS message timer may be updated.
Through the method, the mobile node can send the DIS message to at least one neighbor node within the time period indicated by the DIS message timer, and if the DIO message is received, the neighbor node in the current network can be determined. The mobile node may take the neighbor node that sent the DIO message as a candidate parent node and calculate the OF value OF the candidate parent node, adding both to the candidate parent node list. After the DIS message timer is finished, it may be detected whether a new parent node (target parent node) needs to be selected to establish a connection, and if so, the target parent node may be determined according to the OF values OF the candidate parent nodes in the candidate parent node list, and a communication connection may be established with the target parent node. By the method, the mobile node can continuously search for the neighbor node in the network, and quickly determine the target parent node to establish communication connection under the condition of needing to be switched to a new parent node, so that the efficiency and the stability of wireless mobile communication can be improved.
Referring to fig. 13, fig. 13 is a schematic diagram of a unit in a wireless mobile communication device according to an embodiment of the present application. The wireless mobile communication device shown in fig. 13 may be used to perform some or all of the functions in the method embodiments described above with respect to fig. 2, 10, 11 and 12. The apparatus may be a mobile node, an apparatus in a mobile node, or an apparatus capable of being used in conjunction with a mobile node.
The logical structure of the apparatus may include: a communication unit 1310, a processing unit 1320, and a connection unit 1330. When the apparatus is applied to a mobile node:
a communication unit 1310, configured to send a DIS message to at least one neighboring node within a time period indicated by a DIS message timer requested by the mobile node;
a processing unit 1320, configured to, if receiving the information object DIO message, take a neighbor node that sends the DIO message as a candidate parent node, and add the candidate parent node to the candidate parent node list;
the processing unit 1320 is further configured to detect whether a condition for reestablishing a communication connection is met after the period OF time elapses from the beginning OF the timing OF the DIS message timer, and if the condition is met, determine a target parent node from at least one candidate parent node included in the candidate parent node list according to the objective function OF value corresponding to each candidate parent node in the candidate parent node list;
a connection unit 1330 configured to establish a communication connection with the target parent node.
In a possible implementation manner, the processing unit 1320 is further configured to determine an objective function OF value OF the candidate parent node according to a DIO message sent by the candidate parent node; the candidate parent node and the OF values OF the candidate parent node are added to the list OF candidate parent nodes.
In a possible implementation manner, the processing unit 1320 is further configured to, after the time period elapses from the timing OF the DIS message timer, obtain an OF value OF a first parent node if it is detected that the mobile node is currently connected to the first parent node; and detecting whether the OF value OF the first father node is lower than a preset OF value threshold, and if so, determining that the condition OF communication connection reestablishment is met.
In one possible implementation, the mobile node establishes a communication connection with the second parent node within a time period indicated by the information object DIS message timer of the mobile node.
In a possible implementation manner, after the time period has elapsed since the DIS message timer is started, the processing unit 1320 is further configured to detect whether a second parent node is included in the candidate parent node list, and if not, determine that a condition for reestablishing the communication connection is satisfied.
In one possible implementation, the mobile node establishes a communication connection with the second parent node within a time period indicated by the information object DIS message timer of the mobile node.
In a possible implementation manner, if the average signal quality ARSSI value of the second parent node transmission signal received by the mobile node is detected to be lower than the preset ARSSI value threshold within the time period indicated by the DIS message timer requested by the information of the mobile node, the processing unit 1320 is further configured to determine that the condition for reestablishing the communication connection is satisfied.
In a possible implementation manner, the processing unit 1320 is further configured to update the running duration of the DIS message timer to an initial running duration to obtain an updated DIS message timer if it is detected that the mobile node is not connected to any parent node within a time period indicated by the DIS message timer of the mobile node; within the time period indicated by the updated DIS message timer, transmitting a DIS message to at least one neighbor node; if receiving the information object DIO message, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list; after the time period elapses from the timing OF the updated DIS message timer, determining a target parent node in at least one candidate parent node included in the candidate parent node list according to the target function OF value corresponding to each candidate parent node in the candidate parent node list; the connection unit 1330 is further configured to establish a communication connection with the target parent node.
In a possible implementation manner, the processing unit 1320 is further configured to determine, according to the OF value corresponding to each candidate parent node in the candidate parent node list, a candidate parent node with a maximum OF value among at least one candidate parent node included in the candidate parent node list as the target parent node.
In a possible implementation manner, after determining a target parent node in at least one candidate parent node included in the candidate parent node list according to an objective function OF value corresponding to each candidate parent node in the candidate parent node list, the processing unit 1320 is further configured to determine a first operation duration according to a DIO message sent by the target parent node; updating the running time length of the DIS message timer to a first running time length to obtain an updated DIS message timer; the communication unit 1310 is further configured to send a DIS message to at least one neighboring node within a time period indicated by the updated DIS message timer, and the trigger processing unit 1320 executes, if the information object DIO message is received, to take the neighboring node that sends the DIO message as a candidate parent node and add the candidate parent node to the candidate parent node list.
In a possible implementation manner, after the DIS message is sent to at least one neighboring node within a time period indicated by a DIS message timer requested by the mobile node, the processing unit 1320 is further configured to update the running duration of the DIS message timer to an initial running duration to obtain an updated DIS message timer if a DIO message sent by any neighboring node in the at least one neighboring node is not received; the communication unit 1310 is further configured to send a DIS message to at least one parent node during a time period indicated by the updated DIS message timer, and trigger the processing unit 1320 to execute, if the notification DIO message is received, taking the parent node sending the DIO message as a candidate parent node, and adding the candidate parent node to the candidate parent node list.
In one possible implementation, the DIS message includes an identity MS indicating that the mobile node is in a moving state, and the DIO message includes an identity MF indicating that the mobile node is in a moving state.
Referring to fig. 14, fig. 14 is a simplified block diagram of a wireless mobile communication device according to an embodiment of the present disclosure, where the device includes a processor 1410, a memory 1420, and a communication interface 1430, and the processor 1410, the memory 1420, and the communication interface 1430 are connected via one or more communication buses.
The processor 1410 is configured to support the wireless mobile communication device to perform the functions corresponding to the methods in fig. 2, fig. 10, fig. 11, and fig. 12. It should be understood that, in this embodiment of the application, the processor 1410 may be a Central Processing Unit (CPU), and the processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 1420 is used to store program codes and the like. Memory 1420 in embodiments of the present application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example and not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM), SDRAM (SLDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).
Communication interface 1430 is used for sending and receiving data, information, messages, etc., and may also be described as a transceiver, transceiving circuitry, etc.
In the embodiment of the present application, when the wireless mobile communication device is applied to a mobile node, the processor 1410 invokes the program codes stored in the memory 1420 to perform the following operations:
the control communication interface 1430 sends the DIS message to at least one neighbor node within a time period indicated by the information request DIS message timer of the mobile node;
processor 1410 calls a program code stored in memory 1420, and if receiving an information object DIO message, takes a neighbor node that transmits the DIO message as a candidate parent node, and adds the candidate parent node to a candidate parent node list;
processor 1410 calls a program code stored in memory 1420, after the time period elapses from the timing OF the DIS message timer, to detect whether a condition for reestablishing a communication connection is satisfied, and if so, determines a target parent node among at least one candidate parent node included in the candidate parent node list according to an objective function OF value corresponding to each candidate parent node in the candidate parent node list;
control communication interface 1430 establishes a communication connection with the target parent node.
In one possible implementation, processor 1410 invokes program code stored in memory 1420 to determine an objective function OF value for a candidate parent node based on a DIO message sent by the candidate parent node; the candidate parent node and the OF values OF the candidate parent node are added to the list OF candidate parent nodes.
In a possible implementation manner, the processor 1410 calls the program code stored in the memory 1420, after the time period elapses from the timing OF the DIS message timer, and if it is detected that the mobile node is currently connected to the first parent node, acquires an OF value OF the first parent node; and detecting whether the OF value OF the first father node is lower than a preset OF value threshold, and if so, determining that the condition OF communication connection reestablishment is met.
In one possible implementation, the mobile node establishes a communication connection with the second parent node within a time period indicated by the information object DIS message timer of the mobile node.
In one possible implementation, after the period of time has elapsed since the DIS message timer was timed, processor 1410 calls program code stored in memory 1420 to detect whether a second parent node is included in the candidate parent node list, and if not, determines that the condition for reestablishing the communication connection is satisfied.
In one possible implementation, the mobile node establishes a communication connection with the second parent node within a time period indicated by the information object DIS message timer of the mobile node.
In one possible implementation, if the processor 1410 calls the program code stored in the memory 1420 to detect that the average signal quality ARSSI value of the second parent node transmission signal received by the mobile node is lower than the preset ARSSI value threshold within the time period indicated by the information request DIS message timer of the mobile node, it is determined that the condition for the communication connection re-establishment is satisfied.
In a possible implementation manner, if it is detected that the mobile node is not connected to any parent node within a time period indicated by the DIS message timer of the mobile node, the processor 1410 calls the program code stored in the memory 1420, and updates the running duration of the DIS message timer to the initial running duration to obtain an updated DIS message timer; within the time period indicated by the updated DIS message timer, transmitting a DIS message to at least one neighbor node; if receiving the information object DIO message, taking the neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list; after the time period elapses from the timing OF the updated DIS message timer, determining a target parent node in at least one candidate parent node included in the candidate parent node list according to the target function OF value corresponding to each candidate parent node in the candidate parent node list; control communication interface 1430 establishes a communication connection with the target parent node.
In a possible implementation manner, processor 1410 invokes program code stored in memory 1420 to determine, according to the OF value corresponding to each candidate parent node in the candidate parent node list, a candidate parent node with the largest OF value among at least one candidate parent node included in the candidate parent node list as a target parent node.
In a possible implementation manner, according to an OF value OF an objective function corresponding to each candidate parent node in the candidate parent node list, after determining a target parent node in at least one candidate parent node included in the candidate parent node list, processor 1410 calls a program code stored in memory 1420 to determine a first operation duration according to a DIO message sent by the target parent node; updating the running time length of the DIS message timer to a first running time length to obtain an updated DIS message timer; in the time period indicated by the updated DIS message timer, the control communication interface 1430 transmits the DIS message to at least one neighbor node, and the trigger processor 1410 calls the program code stored in the memory 1420 to execute, if the information object DIO message is received, taking the neighbor node transmitting the DIO message as a candidate parent node, and adding the candidate parent node to the candidate parent node list.
In a possible implementation manner, after the DIS message is sent to at least one neighbor node within a time period indicated by the DIS message timer requested by the mobile node, the processor 1410 invokes the program code stored in the memory 1420, if a DIO message sent by any neighbor node in the at least one neighbor node is not received, updates the running duration of the DIS message timer to an initial running duration, and obtains an updated DIS message timer; in the time period indicated by the updated DIS message timer, the control communication interface 1430 sends a DIS message to at least one parent node, and the trigger processor 1410 calls the program code stored in the memory 1420 to execute, if receiving the advertisement DIO message, taking the parent node that sent the DIO message as a candidate parent node, and adding the candidate parent node to the candidate parent node list.
In one possible implementation, the DIS message includes an identity MS indicating that the mobile node is in a moving state, and the DIO message includes an identity MF indicating that the mobile node is in a moving state.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the processing equipment of the embodiment of the invention can be merged, divided and deleted according to actual needs.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, memory Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (12)

1. A wireless mobile communication method applied to a mobile node, the method comprising:
within a time period indicated by an information request DIS message timer of the mobile node, transmitting a DIS message to at least one neighbor node;
if receiving an information object DIO message, taking a neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list;
after the time period elapses from the timing OF the DIS message timer, detecting whether a condition for reestablishing a communication connection is satisfied, and if so, determining a target parent node in at least one candidate parent node included in the candidate parent node list according to an objective function OF value corresponding to each candidate parent node in the candidate parent node list;
and establishing communication connection with the target parent node.
2. The method of claim 1, wherein adding the candidate parent node to a list of candidate parent nodes comprises:
determining an objective function OF value OF the candidate parent node according to the DIO message sent by the candidate parent node;
adding the candidate parent node and the OF value OF the candidate parent node to the list OF candidate parent nodes.
3. The method of claim 1, wherein the detecting whether the condition for communication connection re-establishment is satisfied after the time period has elapsed since the DIS message timer started comprises:
after the time period is started from the timing OF the DIS message timer, if the mobile node is detected to be currently connected with a first father node, acquiring an OF value OF the first father node;
and detecting whether the OF value OF the first father node is lower than a preset OF value threshold, and if so, determining that the condition OF reestablishing the communication connection is met.
4. The method of claim 1, wherein the mobile node establishes a communication connection with a second parent node within a time period indicated by a DIS message timer of an information object of the mobile node;
the detecting whether a condition for communication connection re-establishment is satisfied after the time period elapses from the timing of the DIS message timer includes:
after the time period is started from the timing of the DIS message timer, detecting whether the candidate father node list comprises the second father node or not, and if not, determining that the condition of reestablishing the communication connection is met.
5. The method of claim 1, wherein the mobile node establishes a communication connection with a second parent node within a time period indicated by a DIS message timer of an information object of the mobile node;
the method further comprises the following steps:
and if the average signal quality ARSSI value of the signal sent by the second father node and received by the mobile node is detected to be lower than a preset ARSSI value threshold value in the time period indicated by the DIS message timer of the information request of the mobile node, determining that the condition of reestablishing the communication connection is met.
6. The method of claim 1, further comprising:
if the mobile node is detected not to be connected with any father node in the time period indicated by the DIS message timer of the mobile node, updating the running time of the DIS message timer to the initial running time to obtain an updated DIS message timer;
within the time period indicated by the updated DIS message timer, transmitting DIS messages to at least one neighbor node;
if receiving an information object DIO message, taking a neighbor node sending the DIO message as a candidate father node, and adding the candidate father node into a candidate father node list;
after the time period elapses from the timing OF the updated DIS message timer, determining a target parent node from at least one candidate parent node included in the candidate parent node list according to the target function OF value corresponding to each candidate parent node in the candidate parent node list;
and establishing communication connection with the target parent node.
7. The method according to any one OF claims 3 to 5, wherein the determining a target parent node among at least one candidate parent node included in the candidate parent node list according to the OF value corresponding to each candidate parent node in the candidate parent node list comprises:
and determining the candidate parent node with the maximum OF value as the target parent node from at least one candidate parent node contained in the candidate parent node list according to the OF value corresponding to each candidate parent node in the candidate parent node list.
8. The method according to claim 1, wherein after determining a target parent node among at least one candidate parent node included in the candidate parent node list according to the OF value OF the objective function corresponding to each candidate parent node in the candidate parent node list, the method further comprises:
determining a first operation duration according to a DIO message sent by the target father node;
updating the running time length of the DIS message timer to the first running time length to obtain an updated DIS message timer;
and in a time period indicated by the updated DIS message timer, sending a DIS message to at least one neighbor node, triggering and executing the step of taking the neighbor node sending the DIO message as a candidate father node if receiving an information object DIO message, and adding the candidate father node into a candidate father node list.
9. The method of claim 1, wherein after transmitting a DIS message to at least one neighboring node within a time period indicated by a DIS message timer requested by the mobile node, the method further comprises:
if the DIO message sent by any one of the at least one neighbor node is not received, updating the running time of the DIS message timer to the initial running time to obtain an updated DIS message timer;
and in a time period indicated by the updated DIS message timer, sending a DIS message to at least one father node, triggering and executing the step of taking the father node sending the DIO message as a candidate father node if receiving an advertisement DIO message, and adding the candidate father node into a candidate father node list.
10. The method of claim 1 wherein the DIS message comprises an identity MS indicating that the mobile node is in a mobility state, and wherein the DIO message comprises an identity MF indicating that the mobile node is in a mobility state.
11. A wireless mobile communication device, comprising a processor, a memory and a communication interface, the processor, the memory and the communication interface being interconnected, wherein the memory is configured to store a computer program, the computer program comprising program instructions, and wherein the processor is configured to invoke the program instructions to perform the wireless mobile communication method according to any one of claims 1 to 10.
12. A computer-readable storage medium having stored thereon one or more instructions adapted to be loaded by a processor and to perform the method for wireless mobile communication according to any of claims 1 to 10.
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